As a Verb or Adjective:
1. To get one's revenge. Idiomatic English = get even.
2. When scoring the competitors or teams in a game, competition or match, to have one point each. English = (be) one all.
Interactive:
1. Used alone to express your pleasure at the fact that you have harmed or annoyed someone who has harmed or annoyed you. English = 'Now we're even!'